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-title = "rust basic -- types and ownership"
-date = 2023-01-12
-[taxonomies]
-categories = ["code"]
-tags = ["rust"]
-[extra]
-math = false
-+++
-
-## Types
-> This is a summary of rust basic knowledge I learned from (Rust the Book)[https://doc.rust-lang.org/book/] chapter 1 ~ chapter 13
-> I will use C to compare with since I familiar it.
-
-There are a bunch of built-in types we can work with: *scalar types* and *compound types*.
-Those scalar types are just alike as C language.
-
-|  scalar types     |    rust       |  c   	|
-| ------------- |-------------  | ------- |
-|    integer    |    i(u)8/i16/i32(default)/i64          | (unsigned) char/short/int/long       |
-|    float    |      f32/f64(default)        |  float/double      |
-|    boolean    |    true/false             |   True/False (non-zero/zero)  |
-|    character  |   char                    |       char                    |
-
-The compound types are a bit different. rust provides many hands-on types where C type is not the same or needs to define explicitly.
-
-|  compound type    |    rust       |  c   	|
-| -------------     |-------------  | ------- |
-|    struct         |    same       | same       |
-|    enum           |    enum element can be seen as key that could take value          |   represent numberic value, default starting from 0     |
-|    array          |   vector      |   array |
-|    string         |   a wraper of vector      |   pointer of char *  |
-|    tuple          |   exist       |   no such type in C |
-
-Variable declaration in rust is kinda tricky.
-
-A normal declare syntax would be like `let unmutable_variable = 3`. This will imply that variable is `i32` type
-since the value we assign to is a integer and the default type for integer on most OS is `i32`.
-We can explicit type by using type annotation: `let unmutable_variable: u8 = 3`. This will make variable
-`unmutable_variable` is `u8` type and has 3 as its value. We need to assign a value
-to variable if we don't annotate type while declaration, otherwise compiler would prompt error.
-
-Notice that, declaration as above one won't allow us to change value, if we want to be able to change variable's
-value at runtime, we need to explicit it, for security reason: 
-```rust
-let mut mutable_variable = 3;
-println!("first define: {mutable_variable}");
-mutable_variable = 5;
-
-println!("change value to: {mutable_variable}");
-```
-
-> `println!()` is called macro, which would not cover for now.